Machine for preparing tires for retreading



se t fzo, 1938. J, L. ELLY I 2,130,627

MACHINE FOR PREPARING TIRES FOR RETREADING Filed June 14, 1937 5 Sheets-Sheet 1 INVENTOR.

7171.21. eZZ

:4 A ORNE NJ. KELLY 2, 30,627

MACHINE FOR PREPARING TIRES FOR RETREADING Sept. 20, 1938.

Filed June 14, 1937 5 Sheets- Sheet 2 41 l E Inmn-ummuuu:

- INVENTOR. Jaimlzilly Sept. 20, 1938. J. L.-KELLY 2,130,627

MACHZFNE FOR PREPARING TIRES FOR RETREADING Filed June 14, 1937 5 Sheets-Shept 3 jax 1N VENTOR.

ATTO Y. I

Patented Sept. 20, 1938 UNITED STATES MACHINE FOR PREPARING TIRES FOR RETREADING John L. Kelly, Los Angeles, Calif.

Application June 14, 1937, Serial No. 148,165

22 Claims.

This invention relatesto and has for an object the provision of a machine which is selectively operable to cut away and treat substantially all either or both side walls to predetermined depths and which,-after being thus set, will automatically and uniformly remove and' treat the predeter- 15 mined outer circumferential areas of the tire without further attention of theoperator.

Another object is to provide a machine of the characterdescribed which maybe quickly and accurately set for treatment of the tires of given sizes for removing the tread cap only or the entire tread only or the entire tread and either or both side walls, and may thereafter be operated entirely automatically to perform the selected operation and, at the same time, abrade the cut surface ot the tire to prepare the tire for retreading or repair in one operation. l

Yet another object is to provide a machine of I the character described which will include an anvil around and in engagement with which the tire is rotated, and motor driven cutting and rasping tools which are moved. transversely of and-in engagement with the tire during the'rotation of the latter,-said tools 'beingengaged with the tire at points opposite said-anvil, together with a selective setting means for predetermining the extent of transverse inov'ementoi' said tools and the points in their transverse movement at which the tools will be applied toand removed iromthetire.

I hav'eshown in the accompanying drawings a preferred form of a machine for preparing tires for retreading embodying my invention, subject.

however, to modification, within the scope of the 45 spirit of my invention. 3 g

In said drawings:

appended claims, without departing from the Fig. 4 is a. vertical section with broken tively set for a predetermined treatment of the the tire whereinone side wall tread has been removed;

away and portions shown in side elevation for the sake of clarity of illustration;

Fig. 5 is adiagrammatic view showing a tire and the cutter and indicating the manner in which the tread is cut away during an operation 5 of the machine;

Fig. 6 is a diagram-showing the movement of the cutter necessary for removing the cap portion only of the tread;

Fig. 7 is a view similar to Fig. 6-showing the movement of the cutter and a depth of cutas when removing the entire tread portion;

' Fig. 8 is a view similar to Figs. 6 and '7 showing the extent of the cut and movement of the cutter necessary to remove thetread and side walls;

Figs. 9, 10 andll are side elevations of templates for determining the cuts shown in Figsrfi, '7 and 8, respectively;

Fig. 12 is a fragmentary horizontal section of the tire holding and rotating means, with certain parts in top plan;

, Fig. 13 is an enlarged fragmentary front elevation of the means shown in Fig. 12, with certain parts in section;

Fig. 14 is a detail section of the tire supporting 'anvil taken on the plane of line l4-l4 of Fig. 13;

Fig. 15 is a section taken on the plane of line l5-1-li otFig. 13;

Fig. 16 is a section taken on the plane of line l5-l8 of Fig. 13; g

Fig. 17 is a diagram showing the paths of movement traversed by the cutter relative to the tire when a given detreading operation of the machine is carried out;

Fig. 18 .is a diagramshowing the cutter and 3 controlmeans and electrical circuit'for the latter when the machine is in normal or starting positionand the control. is set for effecting the removal of the tread and both'side walls of a tire.

the extent of the cut to be'made being indicated by dotted lines in the showingor the tire;

Fig. 19- is a view similar to Fig. 18 but showing the positions of the cutter and control means as when beginning the first cutting operation; I Fig. 20 is aview similar to Figs. 18 and. 19 showing the position of the cutter and control means n havi com leted the firstcuttin o r- Fig..'1 is a front elevation of a machine conas w Hg P g pe structed in accordance with this'invention, parts .Fig. 18 position, the extent of cut made on this first operation being indicated in the showing of- 0 and half of-the Fig. 21 is a view similar to Figs.,'18,- 19 and'20,

"showing the, positions of the cutter and control means as when the cutter'is' starting its second variable speed switch, showing the means foroperating the same manually;

Fig. 23 isa sectional view taken on the plane of line 23-23 of Fig. 22;

Fig. 24 is a sectional view taken on the plane of line 24-24 of Fig. 22;

Fig. 25. is a diagram of the employed. I

In one embodiment of the invention, the machine generally comprises a frame A, a tire supporting anvil B, a combined tire holding and rotating means for rotating the tire D around and. while engaged with said anvil; a motor driven tire detreading cutter E for removing the tread and side wall portions of the tire; a motor electrical circuits driven rasp F for toughening the tire surface after the out has been made; an oscillatory carriage G for moving said cutter and rasp transversely across the tire at points opposite the anvil, a tool applying means H for. moving the cutter and rasp relative to the,carriage into and out of operative contact with the tire; a drive means J for oscillating the carriage; a manually adjustable control means K, when set manually,

. will automatically effect predetermined transverse movements of the butter and rasp relative to predetermined points of engagement thereof with the tire; and a templet means L selectively operable for determining the depth and contour of the surface removal cuts to be made in tires ofdifferent sizes and hydraulic means M for shifting the tire holder C for centering tires of different sizes.

More specifically, the control means K'provides for setting the machine to detread and apply the rasp to the cap portion only of the tread, or the entire tread portion, or the tread portion and either or both side walls, and after being manually set for any of the operations, will cause the machine to effect the selected cut in one continuous operation without requiring further manual operation.

- Anvil 'The anvil Bis adapted to rotatably support the tire against the cutter and rasp and comprises arcuate members 2 shaped to correspond to the cross section of a tire and having antifriction rollers thereon. The rollers are adapted to engage the interior of the tire, as shown in Fig. 4, so that although the tire is free to rotate around the anvil, the latter will effectively support the portion of the tire engaged with the cutter and rasp. As here provided, the members.

2 are fixed to. a block I removably supported by a socket 3a on a base plate 4 carried by a nut 5 adjustable on an arm 54: extending up wardly from a post 6 of the frame A. Slidably anchored on the plate 4 are bars 1 and 8 which are adjustable towards and away from one another by a screw shaft 9 rotatably anchored, as at ill, on said plate and threadedly connected with said bars. On the ends of the bars are tire bead clamping rollers ll whereas between and :spacedinwardly of the rollers ii are rollers l2 adapted to engage the inner sidesof the tire beads, as shown inFlg. 14.

when a-tire is to be set up in the machine, it

; .is hung on the anvil members 2 so as to encompass them and the bead portions of the theatre fitted between the rollers II and I2, whereupon the screw shaft 9 is operated to move the bars I and 8 so that said rollers will hold the tire to amass? close engagement with the anvil members, while permitting the tire to be freely rotated.

Tire holding and rotating means The means C comprises a hollow circular body ii on which .is mounted a circular series of the driving rollers it which are radially movable into and out of contact with the bead portions of the tire for supporting and rotating the tire. These rollers l5 are fixed on shafts l1, which are supported by adjusting screws i8. The screws 23 rotatable on a stud 24 on the front wall 25 of said body. A hand wheel 25 provides for rotation of the gear 23 and when manipulated causes -a relatively great and rapid movement of ,the

screws l8, due to the greater lead"of the threads thereon and the internal threads of the sleeves I9 compared to a shorter movement required of the sleeves in openings 20. Thus the holding and driving rollers I6 may be quickly moved to effect the setting up and removal of a tire.

The rollers iii are driven by a motor 21 supported by the body i5 and having its shaft 21a provided with a drive pinion 28 which meshes with a larger gear 29 mounted on stud shaft 20 on said body. A hub 3| of the gear 29 carries a beveled gear 32 which meshes with pinions 3! carried by radial shafts 24 on the body I5; These shafts 34 drive the rollers l6 through pinions 35 and 36 fixed on the shafts 34 and I1 respectively. A circuit closer 31 controls the motor 21, which it will now be seen will rotate the tire at a constant predetermined speed'around the anvil B, while the cutter indicated in Fig. 13, are engaged with and moved transversely of the tire in the path of said anvil.

Means for centering the tire holding and rotating apparatus The means M comprises a hydraulic jack I. mounted on the frame A and connected as at 40 with the body l5, which latter-,itwill be noted, is vertically adjustably secured on the post 5 by means of the slidably interlocked guides 42 and 43 on said post 6 and body, respectively. The jack is controlled by lifting and lowering treadle valves 44 and 45 to which pipes 46 lead from a source of hydraulic fluid under pressure, not shown. A hydraulic latch 4! is also controlled by said valves through the pipes 48 and 49 whereby the latch member 50' will move into locking engagement with a notched member 5! of the body to hold the latter Adjustment of the body i5 is effected to center the rollers IE to tires of different sizes, it being noted that the motor 21 and roller drive means are moved with said body.

Detreading tools and oscillatory can-loge therefor As here shown the cutter E, which is circular in position of adjustment.

E and rasp F, as.

and has a beveled cutting edge, is mounted on a horizontal shaft 53 in a bearing 54 on the carriage G, whereas the rasp F is circular and similarly mounted on a shaft 55 and, motors 55 and 51, respectively, operate said shafts. These tools are mounted so that their flat faces are in closely spaced relation at a point opposite the anvil B and midway of the sides of the carriage. The carriage G is of an inverted U shape with its free ends mounted to oscillate on horizontal axes I 58 and 58 on the frame A. These axes are in a sides 8| of the carriage, said shoes carrying the shafts 58 and 55 and motors 58 and 51, and being joined by a shaft 82 extending therebetween. The shaft 52 has pinions 83 and 84 fixed thereon so as to mesh with rack bars 85 and 88 fixed on the sides 6| 'of the carriage, whereby said shoes will move in unison, and the tools E and F-likewise As here shown, the means H for controlling the application of the tools E and F to the tire comprises a hydraulic jack 81 connected to one of the shoes 80 and fixed on the carriage G. This jack is controlled by an automatic valve 88 forming a part of the control means K and connected to the jack by pipes 68 and 10.

The means J for oscillatingv the carriage G comprises a variable speed reversible multiphase motor 1| fixed on the frame A and driving the axis 58 of the carriagethrough a variable speed transmission means 12 and a gear train 12a. The

motor is controlled by an automatic variable speed and reversing switch 13, and also by an operating handle 14 for the transmission means 12, which latter is operable for changing the speed of the motor over a wire range at will.

Automatic control means The switch 13 is arranged to reverse the main motor 1| and vary its speed and its operating duration through action of the means K, which latter comprises a series of normally open circuit control switches 15, 16, 11, 18, 18, 88 and 8| supported above the motor 18 and having hinged depressible actuators 82, 83, 84, 85, 88, 81 and 88, which are movable from position, shown in dotted lines in Fig.3, to an upright position and maintained in upright position by springs 88; When in upright position, these actuators are subject to depression by a cam trip member 80, which is carried by a rack bar 8| driven by a worm and pinion'drive means 83 from the axis 58 of the carriage G and supported in bearings 83. The movement of the rack bar and cam trip 80 is timed with that or the carriage so that the trip will engage and disengage and thereby depress andrelease the actuators 82 to 88, inclusive, and consequently close and open switches 15 to 8|, inclusive, or certain of them, when'the carriage is in predetermined positions; depending on the particular actuators set in up or operative position. When depressed, said actuators engage and close the circuit closers 15 to 8|, inclusive, and when released, permit the circuit closers to spring into open position.

The circuit closers 15 .to 8|, inclusive, are em ployed to control the operation of solenoids 84 and 85 having a common armature 88, which lat ter is connected with a slotted crank arm 81 of the valve 88. These circuit closers also control a solenoid 88 which operates the automatic switch 13. It should be noted that switch 13 is also manually operable through the means 88. The switch 13 controls the main motor 1|, also the motors 56 and 51 for the cutting tool and rasp, respectively. The solenoid 88 has a rack bar armature I00, which meshes with a ratchet drive means IOI for rotating the shaft I02 of the switch 13. A spring I03 restores the rack bar to operative position when the solenoid is deenerglzed. The switch 18 includes a housing I04 to which the solenoid is secured and wherein the shaft I02 is journalled. On this shaftare collector rings I05 electrically engaging contact elements I08, both in number necessary to control the three phase motor 1|. A contact arm I01 is fixed to the shaft I02 for rotation therewith and has contacts I08, I08 and H insulated from one another thereon and adapted to engage sets III, H2, H3 and.

II4-of fixed contacts on an annular insulation member within said housing. -Conductors H5, H8 and H1 connect the contacts I08 with a source of three phase electric current not shown and are controlled'by a main switch H8. The rings I are connected with the movable contacts I08, I08 and H0 by conductors H8, H8 and I20. A group of three conductors I2I connect the three contacts III with the high speed windings I22 of motor 1|.. Conductors I23, in a group of three, connect the three contacts II2 with the slow speed windings I24 0! the motor 1| and the latter winding is arranged to cause the motor to rotate in a diflerent direction-than when the high speed winding is energized. A set of three conductors I25 connects the three contacts II3 with the conductors I2I; and a set of conductors I28 connects the three contacts II4 with the slow speed winding I24. The latter set I28 of conductors is reversed compared to conductors I23 whereby to reverse the motor. Conductors I21 and I28 connect the cutter and rasp motors with conductors I23 and I28, which latte are employed to operate the slow speed win g of the motor 1| only when the cutter and rasp are applied to the tire, whereby the cutter and .rasp will be rotated at such times only.

The circuit closer-18 is adapted to be closed when the machine is in starting position, as shown in Figs. 1, 18, 20 and 25. One side oi this circuit closer is connected by a conductor I28 with the line conductor II8, whereas a conductor I30 leads from the other side of said circuit closer to thesolenoid 84. This solenoid is connected in series with solenoid 88 by conductors I3I and I32, which latter leads to the line conductor II5. Circuit closers 18 to 8|, inclusive, are respectively connected by conductors I33 I34, I35-I38, and I31-I38, with solenoid 85 and conductors I28, which latter is connected with line conduc- 7 Template The template means L comprise a U-shaped frame I50 having supporting barsiil and I52 for a series of templates I53. Certain of these templates are shown in Figs. 9 to 11 inclusive as of different shapes and formations to cut the head cap, tread, and tread and side walls, respectively. I

vide for changing the templates.

are interchangeable with templates of difierent form, as, *for example, those shown in Figs. 9, 10 and 11.

The bars I5I and I52 are withdrawable to pro- Each template has a curved surface I50 adapted to be engaged by a roller I55 on a carriage I58, which is laterally slidably supported on a rigid extension I58 of one of the shoes 58. The roller I55 is moved to position to contact the template desired and when engaged with a selected template will determine the depth and contour of the' cut made in the tire inasmuch as the cutter and rasp willfollow the curve and shape of the template.

OWE-i201],

Assuming that a tire set up in the machine, as shown in Fig. 1, isto be detreaded to the extent of removing the tread and side walls to .a predetermined depth, the roller I55 is placed on a template oi the group shown in Fig. 1 such,

'for example, as the-one shown in Fig. t 11, or proper size for the particular tire. The operator now raises the actuators 82, 85 and 88 for circuit closers I5, I8 and BI into up position, as shown in Fig. 18, and the cam trip member .88 will engage and depress the actuator 85 whereby to close the circuit closer I8. {I'he operator next closes switches 31 and III in the order named and the tire rotating motor 21 starts the rotation of the tire, whereas circuit closer I8 (see Fig. 18) now causes the solenoids 84 and 88 to be energized through conductors 8, I28, I88, solenoid 84, conductor I8I, solenoid '88, and conductor I82, to other line conductor II5. Solenoid 88 does not at this time move the armature 88 as the armature has been previously moved to position shown in Fig. 18. Valve I8 is now in position to direct operating fluid from a source not shown to the Jack 81 so as to hold thecutter and rasp retracted.

However, the solenoid 88 now operates through the ratchet drive IOI to rotate the shaft I02 of the switch device 81 whereby the contact arm I0I moves from its oi! position, as shown'in Fig. 25, into position to cause contacts I08, I08

and H0 to engage contacts III. This connects the high speed winding I22 of the motor and the latter operates, as previously described, through the transmission I2 and gear train. 12a to swing the carriage G to the left of its upright position, whereby the cutter E and rasp F will describe the arc, as indicated by the line 8 in Fig. 17. As soon as the carriage G begins to move, the cam trip 88 is disengaged'from the actuator 85 as said trip moves to the right of its position shown 7 whereby the solenoids 84 and 88 become deenerin Fig. 18,-and circuit closer I8 immediately opens gized. The spring I88 now retracts the rack bar I00 relative to the ratchet drive means IM and the switch I8 is thus made ready for its next operation. \7

When the carriage 1 reaches the limit or its swing to the left, the-rack bar 8! will have moved to the right of its position shown in Fig. l8 to the position shown in Fig. 19, and the cam trip 80 will engage and depress the actuator 88 and thereby close the switch 8i. This closes the circult for the solenoids 85 and 88 through the circuit previously described. Solenoid 85 now moves the armature 88 to the position shown in Fig. 19 and the valve 88 is'- thereby movedto its Fig. 19 position whereby to direct the operating .fiuid through pipe I0 to the outer end of the hydraulic jack 81, which then functions to move the shoes 80 inwardly, whereby the cutter E and rasp F carried thereby are applied to the tire at a point opposite the anvil B. The line I in rasp .are closed. Thus, the main motor and cutter and 'rasp motors are now simultaneously operated and the first cutting or detreading operation commences. F It should be noted that the winding I28 of the main motor will cause the motor to rotate in the opposite direction compared to its operation with the high speed winding. Thus' the carriage G will be swung from left to right, and with the rasp and cutter will follow the path inchcated by the line U in Fig. 17, at a slower rate than when moved through path S. This moves the rotating cutter and rasp transversely of the tire while the latter is driven by the motor 21, and one side wall and half of the tread will be cut away, as indicated in Fig. 20.

It should be noted that when the cutter engages the tire at the beginning of the first cutting operation, as shown in Fig. 19, it is desirable to have the tire rotate through one complete revolution before the transverse movement of the cutter is commenced, as otherwise an uneven cut would be made instead of the circumferentially uniform cut. Such a uniform cut is shown at x in Fig. 5 wherein the successive cuts are indicated by the dotted lines Z, these lines indicating the progressive cutting action.

In order to substantially hold the cutter E from moving until the tire is rotated through at least one revolution, as aforesaid, the operator manipulates the handle ll of the transmission means I2 so as to reduce the rate of movement 0 oi the carriage G to such extent that an apprevaried as desired through use of the variable speed transmission 12.

As the 'cutter El removes the outer covering.

of the tire, the rasp F following behind the cutter produces the desired toughening of the remaining surface, as is desirable in this art. Thus when, for example, the cutter and reap have traversed the first cutting movement, as indicated by the line U in Fig. 1'7, a predetermined amount of rubber will have been removed from approxi= inately one-half of the tire, and that portion is then in condition for retreadlng. Thus, it is seen that one complete sidewall and one-half of the tire tread is cut away and .rasped in one operation.

' When the carriage G arrives in upright position, as when completing the; first cutting operation, the trip have been moved back to engage actuator 8,\and switch I8 is again closed. This closes the circuit for and energizes solenoids 80 and 88 and the armature 88 is moved from position shown in Fig. 19 to position shown in 10 shut off the motors 50 and 51 and to connect the high speed windings I22 with the switch and line conductors through conductors I25 and HI.

This causes the carriage G to swing to the right;

(see Fig. 4) so that the cutter and rasp follow the path indicated by, the line Z inFig. 1'7. It

should be noted that conductors I25 reverse the line connections to conductors I2l whereby the motor will operate in the reverse direction as when conductors I2I connect it with the line conductors.

When the cutter and rasp reach the position on the other side (right) of the tire, as shown corresponding to that shown in Fig. 19, the trip 00 will have moved to the left and have depressed the actuator 82 whereby the switch 18 is closed. This closes the circuit for the solenoids 85 and 88 and the armature 06 is moved to position shown in Fig. 19 whereby valve 08 will cause the jack 51 to move the cutter and rasp against the tire.

- At the same time, solenoid 98 operates the switch 18 so that the contacts I08, I00 and H0 will engage contacts Ill. I This causes the low speed winding I24 to be connected to line conductors through conductors I26 and the motors 56 and 51 for the cutter and rasp to be started, (conductors I21 and I28 connect motors 58 and 51). The conductors I26 reverse the application of line current to the motor winding I 24 and conse quently the motor swings the carriage G upward and the cutter and rasp move through the path shown by line Z in Fig. 17 and thereby cut away and abrade the side wall and remaining tread portion to the extent shown by dotted lines in F18. 18.

5 When the cutter and rasp reach the top of -the stroke thereof, the trip 90 is again moved to depress the actuator 85 which closes switch I8, whereby solenoids 94' and 98 are energized. This causes valve" to operate so that the jack 5 51 will retract the cutter and rasp to position shown in Fig. 18. Furthermore, the solenoid 98 at this time operates the switch 13 so that the contacts I08, I09 and H0 are moved into the "05 position shown in Fig. 25, thereby shutting off the motors 58 and 51 for the cutter and rasp j t and also the main motor, and the operation is thus completed.

It will now be seenthat with one continuous automatic'operation, the machine of the inventor '30 will remove the outer covering of a tire between lifted to operative position, whereas the other" actuators are left in inoperative position. The machine will follow the same cyclical operation asxpreviously described, but the extent of trans- 75 verse movement of the cutter and rasp is shortened so. that the cutter is applied at one side of the cap portion then moved towards the center of the cap,'then lifted, then moved to the other side of cap, then applied,'then moved towards thecenter again, and finally lifted. 5

When making a fulltread removal without cut -I ting the side walls, the actuators 83, 85 and 81 only are set. in operative position and theextent of transverse movement of the cutter and rasp is thus increased. The template shown in Fig. 10 10 is employed for the full tread-out and it is seen that the machinefollows the same cyclical operation as when making the maximum detreading cut. 7

It is now seen that the extent of transverse movement made bythe cutter and rasp relative to the tire determines the area, of outer tire covering which may be removed in a given operation of the machine and that the several actu-- ators 82 to 88 and their associated elements make 20 possible a plurality of different automatic detreading-operations covering substantially the entire field of tire preparation treatments practiced in the art of repairing and 'retreading tires.

I claim: r

1. A machine for preparing tires for retreading, comprising tiresupporting means, means for rotating a tire around said means. a rotary cutter, means for rotating said cutter, meansfor moving said cutter back and forth in paths trans- 30 versely of the tire, means for automatically moving the cutter into and out of tire engaging position when the cutter is disposed in diflerent positions in said paths, and control means arranged to be selectively manually set to prescribe 35 different transverse movements'of said cutter and which operates automatically to produce predetermined movements of the cutter in said transverse paths and into and out of tire engaging position. v

2. A machine for preparing tires for retreading, comprising an anvil adapted to engage interiorly or a tire, means for rotating a tire around and in engagement with said anvfl, a rotary tire treating tool, means for rotating saidtool, means for moving said tool in paths transversely of the tire, means. for' automatically moving said tool into and out of position of engagement with'the outer surface of the tire at points opposite the anvil and when the tool is in diflerent positions in said paths and control means foryarying the extent of transverse movement of said tool and the points of application of the tool to said tire.

3. A machine for preparing'tires for retreading, comprising an anvil adapted to engage late;- I riorly of a tire, means for rotating a tire around and in engagement with said anvil, a rotary treating tool, means for rotating said tool, means'i'or moving said tool in paths transversely of the tire, means for automatically moving said tool 90 into and out of position of engagement with the outer surface of the tire at points opposite the anvil and when the tool is in difl'erent positions in said paths and control means for varying the extent of transverse movement of said tool and I the points of application of the tool to said tire, and template means-for controlling the appli cation. a

4. A machine for preparing tiresfor retreading, comprising a tire supporting means,- means for rotating a tire around said'i ineans, a rotary detreading cutter, means for rotating said cutter, means for moving said cutter in paths transversely of the tire during rotation of the latter,

means for moving the cutter into and out of detreading engagement with the outer surface of a tire during rotation of the latter and control means operable selectively for governing the movement of said cutter relative to said tire for selectively cutting away the cap portion of the tread, the entire tread portion and the tread and either or both side walls of the tire.

5. A machine for preparing tires for"retreading, comprisinga tire support, means for rotating a tire around said support, a tire detreading tool, means for moving said tool transversely of the tire, means for moving said tool into andout of engagement with said tire and means controlling the movement cf said tool for selectively cutting away the tread cap, the entire tread and the tread and one or both side walls.

6..A machine for preparing tires for retreading, comprising means for rotating a tire about a fixed axis, a tire detreading tool, means for reciprocally moving said tool transversely of the outer side of a tire substantially from one bead portion of the tire to the other, means for rotating said tool, means for moving said tool into and out of contact with the tire during said transverse movement and means which is manually selectively set to predetermine the movement of said tool before the machine is set in operation, and control means operating to automatically effect a selected movement of the tool when the machine is set into operation.

7. A machine for preparing tlres for retreading, comprising a frame, means on said frame for rotating a tire around a fixed axis, a station-' ary anvil adapted to engage the interior of the tire, a rotary detreading' cutter movable in a transverse path relative to the tire at a point opposite said anvil, means for rotating said cutter, a tire abra'ding tool movable with said cutter, means for rotating said abrading tool, means for moving said cutter and tool into and out of contact with the tire and control means selectively operable for varying the extent of trans-' and m'eansfor automatically moving said cutter into and out of tire engaging position when the cutter is in'difierent positions relative to said.

' ,tire. V

' 9 A machine for preparing tiies for retreading, comprising a frame, means for rotating a tire around a fixed axis on said frame, an oscillatory carriage on the frame, a rotary detreading cutter mounted on the carriage for movement into cutteris in diiferent positions relative to said tire, a tire abrading tool mounted on said carrlage for movement therewith corresponding to that of said cutter and adapted to be engaged and disengaged simultaneouslywith the cutter,

and means for rotating said abrading tool.

.10. A machine for preparing tires for retreading, comprising a frame, means for rotating a tire around a axis on said frame, an oscillatorycarriage on the frame, a rotary detread ing cutter mounted on the carriage for movement into and out of contact with the tire and for movement transversely of the tire upon oscillation of said carriage, means forpscillating said carriage and means for automatically moving said cutter into and out of tire engaging position when the cutter is in different positions relative to said tire, and a stationary anvil engaging the interior. of a tire at a point opposite said cutter.

11.-A machine for preparing tires for'retreading, comprising a frame, means for rotating a the around a fixed axis on said frame, an osclllatory carriage on the frame, a rotary detreading cutter mounted on the carriage for movement into and out of contact with the tire and for movement transversely of the tire upon oscillation of said,carriage, means for oscillating said carriage and means for automatically moving said cutter into and out of the engaging position when the cutter is in different positions relative'to said tire, and template means for controlling the application of said cutter to said tire.

.12. A machine for prep'aringtires for retread- I ing, comprising a frame, means for rotating a tire around a fixed axis on said frame, an oscillatory carriage on the frame, means for oscillating said carriage, means for varying the extent of movement of said carriage in either direction, a tire treating tool mounted on said carriage for movement therewith'in a path transversely of the tire and into and out of contact with the tire, means automatically moving said tool into and out of contact withthe tire when the tool is disposed in different positions relative to saidtire.

13. A machine for preparing tires for retread ing, comprising a frame, means for rotating a tire around a fixed axis on said frame, an oscilla- .tory carriage on the frame, means for oscillating said carriage, means for varying the extent of movement of said carriage in either direction, a

"tire ,treating tool mounted on said carriage for movementtherewith in a path transversely of the tire and into and out of contact with the tire, and a template associated with said carriage and frame for controlling the application of said tool,

to said tire. p

14. A machine for preparing tires for retreading, comprisinga frame, means for rotating a.

tire around a fixed axis on said frame, an oscillatory carriage on the framefmeans for oscillating said carriage, means for varying the extent of movement of said carriage in either direction,

., a tire treating tool mounted-on said carriage for movement therewith ina path transversely of the tire and into and out of contact with the tire. means automatically moving said tool into and out of contact with the tire when the tool is disposed in different positions relative to said tire,

automatically for moving said tool into an opera tive engagement with thetire at a point spaced transversely from the peripheral center line of the tire, then moving the tool approximately to said center line, then removing the tool from contact with the tire and repeating this operation on the other side of saidcenter line.

16. A machine for preparing tires for retreading, comprising. a frame, means on the frame for rotating a tire around a fixed axis, a detreading tool movable transversely of and into and out of engagement with said tire and means operating automatically for moving said tool into an operative engagement with the tire at a point spaced transversely from the peripheral center line of the tire, then moving the tool approximately to said center line, then removing the tool from contact with the tire and repeating this operation on the other side of said center line,and means for varying the extent of transverse movement of said tool while engaged with'said tire.

17. A machine of the character described, including means for rotating a tire around a fixed axis, an anvil adapted for engagement'with the interior of the tire, a stationary support for said anvil, and rollers mounted on said support for contact with the beads only of said tire whereby the tire is in close engagement with said anvil while permitting free rotation of said tire around said anvil.

18. A machine of the character described, in-

cluding means for rotating a tire around a fixed axis, an anvil adapted for engagement with the interior of the tire,'a stationary support for said anvil, tire bead engaging rollers mounted on said support for engaging the tire beads without contacting the side walls of the tire, for holding the tire in close engagement with said anvil while permitting free rotation of said tire around said anvil, and means for adjusting said rollers laterally into and out of position to hold the tire against said anvil.

19. A machine of the character described, including meansfor rotating atire around a fixed axis, an anvil adapted for engagement with the interior of the tire, a stationary support for said anvil, tire bead engaging rollers mounted on said support for holding the tire in close engagement with said anvil, and means for adjusting said rollers into and out of position to hold the tire against said anvil, said anvil comprising arcuate members fixed to said support and anti-friction rollers mounted on said arcuate members for engagement with the interior surface of the tire.

20. A machine of the character described, in-

cluding means for rotating a tire around a fixed axis, an anvil adapted for engagement with the interior of the tire, a stationary support for said anvil, tire bead engaging 'rollers mounted on said support for holding the tire in close engagement with said anvil, and means for adjusting said rollers into and out of position to hold the tire against said anvil, said anvil comprising arcuate members fixed to said support and anti-friction rollers mounted onsaid arcuate members for engagement with the interior surface of the tire, said bead engaging rollers being disposed for engagement with the inner and outer sides of the bead portions of the tire.

21. A machine for preparing tires for retreading, comprising a frame, means on the frame for rotating a tire, a tire treating tool movable transversely of and intoand out of engagement with said tire and means operating automatically for moving said tool into an operative engagement with the tire at a point spaced transversely from the peripheral center line of the tire, then-moving the tool approximately to said center line, then removing the tool from contact with the tire and repeating this operation on the other side of said center line, and means for varying the extent of transverse movement of said tool while engaged with said tire.

22. A machine for preparing tires for retread- ,ing, comprising a frame. means for rotating a tire, a carriage on the frame, a tire treating tool mounted on the carriage for movement into and out of contact with the tire and for movement relative to the tire when said carriageis moved, means for moving said carriage and means for automatically moving said tool into and out of tire engaging position when the tool is disposed in different positions relative to the tire.

oan n- KELLY. 

